## Problem
Of the rectangular, Hanning, Hamming and Blackman windows functions, the rectangular window has the thinnest main lobe:
1. True
2. False
> [!Solution]-
>
> 4. True
>
> From the table in [[spectral features of window functions]], the rectangular window main lobe is $\frac{4\pi}{M}$ while the main lobe of the Hann and Hamming windows is the double and the Blackman is 3 times wider.
>